Do not go low carb while breastfeeding, you will likely end up feeling like shit. Baby will be fine as your body prioritises the milk supply, by that lactose has got to come from somewhere. My wife really stuggles if her carbs get too low, she has been feeding this one (kipping on me right now) for 15 months. The scales will take care of themselves if yiu give it time and eat a sensible moderate carb primal diet.
Also don't IF you need fuel to feed.
Also you store a lot of toxins in your body fat, if you burn off bodyfat too quick while feeding where do you think them toxins are going to go? A 1 to 2 lbs a week loss is more than enough if you are feeding.
I would say you are stessing your body so it won't let go of the weight, chill out, take some time to enjoy the those baby months as they go too fast. Eat sensible moderate carb primal and don't skip meals at the moment.
You know all those pictures of Adam and Eve where they have belly button? Think about it..................... take as long as you need........................